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Submitted on: 09 August 1998.
Revised on: 10 November 1998.
Accepted on: 07 January 1999.
___________________CHEMICAL SENSES---OXFORD UNIV PRESS
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Submitted on: 25 August 2003.
Revised on: 21 December 2003.
Accepted on: 09 February 2004.
___________________CHEMICAL SENSES---OXFORD UNIV PRESS